[BitBucket user: Alain Mazy]
[BitBucket date: 2017-02-01.14:56:50]

we should move this part of code
```
bool OrthancFindRequestHandler::FilterQueryTag(std::string& value /* can be modified */,
                                                 ResourceType level,
                                                 const DicomTag& tag,
                                                 ModalityManufacturer manufacturer)
```
into the ServerEnumerations.cpp file so we can use it in the HierarchicalMatcher (that is used by the plugins)